% 22 Feb 2021 23:19:13
\documentclass{article}
\begin{document}

{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{3}{c}}
\hline\hline
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}\\
            &\multicolumn{1}{c}{Pandemics}&\multicolumn{1}{c}{Wars}&\multicolumn{1}{c}{p-value}\\
\hline
$ h = 0 $   &        0.01         &       -0.06\sym{**} &        0.14         \\
            &      (0.04)         &      (0.03)         &                     \\
[1em]
$ h = 10 $  &       -0.29         &        0.09         &        0.20         \\
            &      (0.24)         &      (0.16)         &                     \\
[1em]
$ h = 20 $  &       -0.56\sym{*}  &        0.28         &        0.04         \\
            &      (0.33)         &      (0.22)         &                     \\
[1em]
$ h = 30 $  &       -0.48         &        0.40\sym{*}  &        0.04         \\
            &      (0.36)         &      (0.24)         &                     \\
[1em]
$ h = 40 $  &       -0.25         &        0.10         &        0.46         \\
            &      (0.38)         &      (0.25)         &                     \\
\hline
Observations&         522         &                     &                     \\
\hline\hline
\multicolumn{4}{l}{\footnotesize Standard errors in parentheses}\\
\multicolumn{4}{l}{\footnotesize \sym{*} \(p<0.1\), \sym{**} \(p<0.05\), \sym{***} \(p<0.01\)}\\
\end{tabular}
}

\end{document}

